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C While Loop Questions and Answers

In most of the MNC interview questions such as in ZOHO interview question, IVTL Infoview interview questions, Amazon interview questions, GOOGLE interview questions, Infosys interview questions and even in Voonik interview questions, We come across several Tricky C Questions about which 2:5 of the questions are from While Loop in c. Solving that kind of tricky C questions is not an easy task for all C programmers. We need more practices to solve it with ease. So we provide 25+ interesting C questions in While Loop to make your MNC interview very easy.

C While Loop Questions

6. What will be the output of the C program?

#include<stdio.h>
int main()
{
		int i = 0;
		while(i < 3, i = 0, i < 5)
		{
			printf("Loop ");
			i++;
		}
	return 0;
}

A. Loop Loop Loop Loop Loop✘

B. Infinite Loop✔

C. Loop Loop Loop✘

D. Prints Nothing✘

x

Option: B

Explanation

The while loop have a condition (i < 3, i = 0, i < 5) is in a format (expression1, expression2, expression3). In each interation the compiler checks each expression. In this program, the loop will be:
Iteration 1: 0 < 3, 0, 0 < 5
Iteration 2: 1 < 3, 0, 0 < 5
Iteration 3: 1 < 3, 0, 0 < 5
Iteration 4: 1 < 3, 0, 0 < 5
the loop continues as infinite because i is intialized to 0 each time.

✉ Answer

7. What will be the output of the C program?

#include<stdio.h>
int main()
{
	int i == 4, j == 7;
	while(++i < --j)
		printf("Loop")
	return 0;
}

x

Option: A

Explanation

The while(--i == --j) is (5 < 6), so the statement inside the loop will executes once, if we go for antother iteration the condition will be wrong.

✉ Answer

8. What will be the output of the C program?

#include<stdio.h>
int main()
{
	int i = 0;
	while(i++)
	{
		printf("Loop ");
		if(i == 3)
			break;
	}
return 0;
}

A. Loop✘

B. Loop Loop Loop✘

C. Loop Loop Loop Loop✘

D. Prints Nothing✔

x

Option: D

Explanation

The condition is while(i++), the expression is post incremented variable. So when it is applied for first time the condition will be False because while(0).

✉ Answer

9. What will be the output of the C program?

#include<stdio.h>
#define NULL 0
int main()
{
	while (NULL == 0)
	{
		printf("Loop");
		break;
	}
	return 0;
}

A. Prints Nothing✘

B. Loop✔

C. Loop Loop✘

D. Compilation Error✘

x

Option: B

Explanation

The condition is true so it returns 1 and excutes the block only once.

✉ Answer

10. What will be the output of the C program?

#include<stdio.h>
int main(){
	int i = 4;
	while(i == 4--)
		printf("Loop ");
	return 0;
}

A. Loop Loop Loop Loop✘

B. Loop Loop loop✘

C. Compilation Error✔

D. Prints Nothing✘

x

Option: C

Explanation

Compilation Error: Lvalue Required
We can't use pre or post increment operator with constants or Literal values. So it will raise an error at compile time.

✉ Answer

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C While Loop Questions and Answers